Detailed Function of HT-XX-20A14B1 reverseparkingsensor: Used in car parking system to detect the distance of the obstacles. I. Certifications: ISO9001:2000/TS16949/RoHS.II. Features of reverseparkingsensor HT-XX-20B/14B1:(1). High Sensitivity;(2). High Reliability;(3). Less Power Consumption;(.